butabarbital5-ethyl-5-(1-methylpropyl)-2,4,6(1H,3H,5H)-pyrimidinetrione5-ethyl-5-(1-methylpropyl)barbituric acid5-sec-butyl-5-ethyl-2,4,6(1H,3H,5H)-pyrimidinetrione5-sec-butyl-5-ethylbarbituric acid5-sec-butyl-5-ethylpyrimidine-2,4,6(1H,3H,5H)-trioneButabarbitalButisolsecbutabarbital